205638040 has 32 divisors (see below), whose sum is σ = 473449680. Its totient is φ = 80341632.

The previous prime is 205638031. The next prime is 205638047. The reversal of 205638040 is 40836502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205638047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58059 + ... + 61498.

Almost surely, 2^205638040 is an apocalyptic number.

205638040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205638040 is an abundant number, since it is smaller than the sum of its proper divisors (267811640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205638040 is a wasteful number, since it uses less digits than its factorization.

205638040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119611 (or 119607 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 205638040 is about 14340.0850764561. The cubic root of 205638040 is about 590.2479471120.

The spelling of 205638040 in words is "two hundred five million, six hundred thirty-eight thousand, forty".